chore(deps): bump com.diffplug.spotless in /flipt-client-java (#1559)

Bumps com.diffplug.spotless from 8.1.0 to 8.2.0.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 8.2.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

flipt-client-java/build.gradle

@@ -4,7 +4,7 @@ plugins {
     id 'java-library'
     id 'maven-publish'
     id 'signing'
-    id "com.diffplug.spotless" version "8.1.0"
+    id "com.diffplug.spotless" version "8.2.1"
     id 'io.github.gradle-nexus.publish-plugin' version '2.0.0'
 }